Transparent wafers +dyed / anti-reflective LOL2000?

Sebastian J. Osterfeld sjo at
Mon May 17 14:22:11 PDT 2004

I am trying to get good lift-off results on transparent substrates, and 
I am running into problems with feature resolution. Sometimes this is 
due to reflection of the UV from the lower boundary of the transparent 
substrate, I hear. This can be avoided by coating the substrate with a 
non-reflective material.

Since I coat my substrates in LOL2000 anyway, wouldn't it be ideal to 
have a *strongly* absorbent and UV-opaque LOL2000 formulation available? 
Would you be able to mix some LOL2000 that would, essentially, be black? 
This should allow me to get good results on a.) transparent substrates 
and b.) reflective materials such as Aluminum.


Sebastian J. Osterfeld
PhD. Student / Shan X. Wang Group
Dept. of Materials Science & Engineering

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